I'm a Winchester guy my self, but to be honest there are several brands out there.
Remington, Savage, Howa,..............the list is endless.
That goes for the 243 as well as the 223. Just go to a good gun store and fondle as many different rifles as you can until you find one that fits you.
I do know that Remington and Savage both make quality 223 that are "target rifle quality right out of the box, at reasonable prices.
If the rifle you like isn't listed as a "target" rifle, don't worry, get a varmint quality..........it'll work.
CPT USAR Ret
USAMU Sniper School Oct '78
Distinguished Rifle Badge 1071